20D Double Aspheric Lens Elimination Spherical Aberration Lens

20D Double Aspheric Lens Useful when slit lamp examination is not possible View the retina including periphery using a head-mounted BIOHigher magnification than 28D 20D Double Aspheric Lens Elimination Spherical Aberration Lens. Magnification 2.97X, Working distance 47 mm.View the retina including periphery using a head-mounted BIOHigher magnification than 28D. Ideal for pediatric examination, when scleral indentation is required and for patients with nystagmus.